/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.dxf2.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.hisp.dhis.dataelement.DataElement;
import org.hisp.dhis.dataset.Section;
import org.springframework.stereotype.Component;

/**
 * @author Abyot Asalefew Gizaw <abyota@gmail.com>
 */
@Component
public class SectionUtils {
  public Map<String, Collection<DataElement>> getOrderedDataElementsMap(Section section) {
    Map<String, Collection<DataElement>> orderedDataElementsMap = new LinkedHashMap<>();

    if (section == null) {
      return orderedDataElementsMap;
    }

    long currentCategoryCombo = -1;

    List<DataElement> groups = new ArrayList<>();

    int counter = 0;

    for (DataElement dataElement : section.getDataElements()) {
      if (currentCategoryCombo == -1) {
        currentCategoryCombo = dataElement.getCategoryCombo().getId();
      }

      if (currentCategoryCombo == dataElement.getCategoryCombo().getId()) {
        groups.add(dataElement);
      } else {
        orderedDataElementsMap.put(
            section.getId() + "-" + currentCategoryCombo + "-" + counter, new ArrayList<>(groups));

        currentCategoryCombo = dataElement.getCategoryCombo().getId();

        groups = new ArrayList<>();

        groups.add(dataElement);

        counter++;
      }
    }

    if (!orderedDataElementsMap
        .keySet()
        .contains(section.getId() + "-" + currentCategoryCombo + "-" + counter)) {
      orderedDataElementsMap.put(
          section.getId() + "-" + currentCategoryCombo + "-" + counter, new ArrayList<>(groups));
    }

    return orderedDataElementsMap;
  }
}
